Would the hotel allow this?
 

I’m wondering if anyone has any experience with whether the situation below would be possible:

We are planning a 3-night stay in Seattle in August. I have enough Marriott points to cover one night at a Category 6 hotel and I have $1,000 of Expedia Rewards credit.

If I booked the first hotel night via Marriott and the second and third hotel night via Expedia for the same hotel, would the hotel let me stay in the same room for the entire duration of my stay or would I be forced to check out and check back in?

Only the hotel can answer that when you check in.
They may not be the same room types/rack price

My experience is that hotels will gladly do this if you contact them directly, in advance, as long as you're not in some specialty room or they're very close to sold out.

Your best course of action would be to call them direction - the individual property needs to deal with this, not Marriott Customer Service, Orbitz, etc.

I have done this many times and as long as the room type and number of beds is the same, I have never had an issue. I have not done this in advance, but have never been disappointed. I often book consecutive, one night bookings and then ask to stay in the initial room. Maybe I have been lucky.

I agree with the others that calling the hotel is the best bet and they will probably be fine with it. The only thing I would add is when you call the hotel you will need to ask for the front desk or reservations manager. Be careful because once you say "reservations" they will want to get you off the phone and dump you into central reservations.

Generally within a room class, a room is a room. So it doesn't matter which one they put you in.

I would try to contact them in advance, however, as others have mentioned.

Yes, though I have had the good fortune of getting an upgraded room the first night, and then having them let me keep it. That would be less likely if I announced my intention to have a 3 night stay up front.

I've combined a paid reservation and a "free night certificate" or points reservation a number of times.

I make sure I've booked exactly the same room category (same view, same number of beds, same designation such as "deluxe" or whatever the hotel calls its standard rooms). Sometimes I cross-reference the reservation number in the comments, requesting to stay in the same room.

With both confirmation numbers at hand, I call Marriott Reservations to link/notate the two reservations.

At check-in, I verify that I'll be in the same room. It's never been a problem. Usually, I don't even have to go to front desk on the day of the switch-over, and the same key cards continue to work.

I'm not saying anyone on this thread gave bad advice about tracking down someone at the hotel. I've just never found it to be necessary. The request just needs to be clear to the hotel's room assigner. Exactly how the room assigner gets that message is less important.